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2. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

3. Little Rock Nine - Wikipedia

   en.wikipedia.org/wiki/Little_Rock_Nine

   The crisis at Little Rock took place amid the Cold War. Civil rights historian Mary L. Dudziak argues that President Dwight D. Eisenhower and the U.S. federal government's primary concern in their response was the world's perception of the U.S. Secretary of State John Foster Dulles was particularly aware of the global impact, telling Attorney ...

4. High availability - Wikipedia

   en.wikipedia.org/wiki/High_availability

   High availability (HA) is a characteristic of a system that aims to ensure an agreed level of operational performance, usually uptime, for a higher than normal period. [1] Modernization has resulted in an increased reliance on these systems. For example, hospitals and data centers require high availability of their systems to perform routine ...

5. How many died in 9/11? A look at the tragic attack 23 years ago

   www.aol.com/many-died-9-11-look-193844783.html

   The 9/11 attacks left 2,977 dead across New York, Washington, D.C. and Pennsylvania, according to the 9/11 Memorial and Museum. That total includes the 2,753 who died in New York, 184 people at ...

6. Availability (system) - Wikipedia

   en.wikipedia.org/wiki/Availability_(system)

   Availability is the probability that a system will work as required when required during the period of a mission. The mission could be the 18-hour span of an aircraft flight. The mission period could also be the 3 to 15-month span of a military deployment. Availability includes non-operational periods associated with reliability, maintenance ...

7. Nines (notation) - Wikipedia

   en.wikipedia.org/wiki/Nines_(notation)

   The purity of a gas is generally expressed as a grade prefixed with the letter N (rather than postfixed), indicating the "number of nines" in the percentage or decimal fraction. For example, a N2.0 gas is 99% (two nines) pure and 1% impurities by volume; a N6.0 gas is 99.9999% (six nines) pure, with 1 part per million (1 ppm or 1 vpm, volume ...